Perm. Com. Room unit, zone 2 — Permanent communication fault with room unit zone 2

What does 97 mean?

There is a permanent communication fault with the room unit for zone 2. This prevents the Heat Pump from receiving information or controlling zone 2, blocking the room unit's operation.

• Communication cables to the room unit are incorrect or incorrectly installed.
• Fault in the communication circuits within the room unit or associated cards.
• Incorrect address set on the dipswitch of the room unit.
• The room unit itself may be faulty or unpowered.

Click steps to track your progress.

1. 1

   Turn off the Heat Pump at the main power supply.

2. 2

   Check all communication cables connected to the room unit for zone 2 for secure and correct connections.

3. 3

   If applicable, verify the dipswitch settings on the room unit match the system configuration.

4. 4

   Restore power to the Heat Pump and check if the alarm has cleared.

5. 5

   If the problem persists, contact a qualified NIBE service technician for diagnosis.